Software RAID1 State : clean, degraded

[Paul Howarth]

Doug Coats wrote:
> I recently installed FC4 64 and created a software RAID for my partitions.
> 
> I arrived at work today to a wonder note stating that the RAID was in
> a degraded condition.
> 
> # mdadm --detail /dev/md2
> /dev/md2:
>         Version : 00.90.01
>   Creation Time : Thu Jun 30 21:29:09 2005
>      Raid Level : raid1
>      Array Size : 115081536 (109.75 GiB 117.84 GB)
>     Device Size : 115081536 (109.75 GiB 117.84 GB)
>    Raid Devices : 2
>   Total Devices : 1
> Preferred Minor : 2
>     Persistence : Superblock is persistent
> 
>     Update Time : Fri Jul  8 09:21:02 2005
>           State : clean, degraded
>  Active Devices : 1
> Working Devices : 1
>  Failed Devices : 0
>   Spare Devices : 0
> 
>            UUID : beacbeb2:3b1ba2dd:9602fa54:4f8fd254
>          Events : 0.71202
> 
>     Number   Major   Minor   RaidDevice State
>        0       0        0        -      removed
>        1       8       19        1      active sync   /dev/sdb3
> 
> I do not think the entire disk has failed since there are two other
> RAIDs using the disk and they report to be working fine.
> 
> What do I do to recover?  Can I recover?

If you believe the "faulty" partition is actually OK, you could try 
re-adding it to the array:

# mdadm /dev/md2 --add /dev/whatever-partition-is-missing

Paul.